281 lines
9.6 KiB
Nix
281 lines
9.6 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.docker-containers;
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dockerContainer =
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{ ... }: {
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options = {
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image = mkOption {
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type = with types; str;
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description = "Docker image to run.";
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example = "library/hello-world";
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};
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imageFile = mkOption {
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type = with types; nullOr package;
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default = null;
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description = ''
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Path to an image file to load instead of pulling from a registry.
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If defined, do not pull from registry.
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You still need to set the <literal>image</literal> attribute, as it
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will be used as the image name for docker to start a container.
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'';
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example = literalExample "pkgs.dockerTools.buildDockerImage {...};";
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};
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cmd = mkOption {
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type = with types; listOf str;
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default = [];
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description = "Commandline arguments to pass to the image's entrypoint.";
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example = literalExample ''
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["--port=9000"]
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'';
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};
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entrypoint = mkOption {
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type = with types; nullOr str;
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description = "Override the default entrypoint of the image.";
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default = null;
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example = "/bin/my-app";
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};
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environment = mkOption {
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type = with types; attrsOf str;
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default = {};
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description = "Environment variables to set for this container.";
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example = literalExample ''
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{
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DATABASE_HOST = "db.example.com";
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DATABASE_PORT = "3306";
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}
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'';
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};
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log-driver = mkOption {
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type = types.str;
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default = "none";
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description = ''
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Logging driver for the container. The default of
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<literal>"none"</literal> means that the container's logs will be
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handled as part of the systemd unit. Setting this to
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<literal>"journald"</literal> will result in duplicate logging, but
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the container's logs will be visible to the <command>docker
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logs</command> command.
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For more details and a full list of logging drivers, refer to the
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<link xlink:href="https://docs.docker.com/engine/reference/run/#logging-drivers---log-driver">
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Docker engine documentation</link>
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'';
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};
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ports = mkOption {
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type = with types; listOf str;
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default = [];
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description = ''
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Network ports to publish from the container to the outer host.
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Valid formats:
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<itemizedlist>
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<listitem>
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<para>
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<literal><ip>:<hostPort>:<containerPort></literal>
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</para>
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</listitem>
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<listitem>
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<para>
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<literal><ip>::<containerPort></literal>
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</para>
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</listitem>
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<listitem>
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<para>
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<literal><hostPort>:<containerPort></literal>
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</para>
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</listitem>
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<listitem>
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<para>
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<literal><containerPort></literal>
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</para>
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</listitem>
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</itemizedlist>
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Both <literal>hostPort</literal> and
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<literal>containerPort</literal> can be specified as a range of
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ports. When specifying ranges for both, the number of container
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ports in the range must match the number of host ports in the
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range. Example: <literal>1234-1236:1234-1236/tcp</literal>
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When specifying a range for <literal>hostPort</literal> only, the
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<literal>containerPort</literal> must <emphasis>not</emphasis> be a
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range. In this case, the container port is published somewhere
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within the specified <literal>hostPort</literal> range. Example:
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<literal>1234-1236:1234/tcp</literal>
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Refer to the
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<link xlink:href="https://docs.docker.com/engine/reference/run/#expose-incoming-ports">
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Docker engine documentation</link> for full details.
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'';
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example = literalExample ''
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[
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"8080:9000"
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]
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'';
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};
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user = mkOption {
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type = with types; nullOr str;
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default = null;
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description = ''
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Override the username or UID (and optionally groupname or GID) used
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in the container.
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'';
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example = "nobody:nogroup";
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};
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volumes = mkOption {
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type = with types; listOf str;
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default = [];
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description = ''
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List of volumes to attach to this container.
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Note that this is a list of <literal>"src:dst"</literal> strings to
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allow for <literal>src</literal> to refer to
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<literal>/nix/store</literal> paths, which would be difficult with an
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attribute set. There are also a variety of mount options available
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as a third field; please refer to the
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<link xlink:href="https://docs.docker.com/engine/reference/run/#volume-shared-filesystems">
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docker engine documentation</link> for details.
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'';
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example = literalExample ''
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[
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"volume_name:/path/inside/container"
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"/path/on/host:/path/inside/container"
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]
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'';
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};
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workdir = mkOption {
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type = with types; nullOr str;
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default = null;
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description = "Override the default working directory for the container.";
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example = "/var/lib/hello_world";
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};
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dependsOn = mkOption {
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type = with types; listOf str;
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default = [];
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description = ''
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Define which other containers this one depends on. They will be added to both After and Requires for the unit.
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Use the same name as the attribute under <literal>services.docker-containers</literal>.
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'';
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example = literalExample ''
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services.docker-containers = {
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node1 = {};
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node2 = {
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dependsOn = [ "node1" ];
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}
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}
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'';
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};
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extraDockerOptions = mkOption {
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type = with types; listOf str;
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default = [];
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description = "Extra options for <command>docker run</command>.";
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example = literalExample ''
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["--network=host"]
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'';
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};
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autoStart = mkOption {
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type = types.bool;
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default = true;
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description = ''
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When enabled, the container is automatically started on boot.
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If this option is set to false, the container has to be started on-demand via its service.
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'';
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};
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};
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};
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mkService = name: container: let
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mkAfter = map (x: "docker-${x}.service") container.dependsOn;
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in rec {
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wantedBy = [] ++ optional (container.autoStart) "multi-user.target";
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after = [ "docker.service" "docker.socket" ] ++ mkAfter;
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requires = after;
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path = [ pkgs.docker ];
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preStart = ''
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docker rm -f ${name} || true
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${optionalString (container.imageFile != null) ''
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docker load -i ${container.imageFile}
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''}
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'';
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postStop = "docker rm -f ${name} || true";
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serviceConfig = {
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ExecStart = concatStringsSep " \\\n " ([
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"${pkgs.docker}/bin/docker run"
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"--rm"
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"--name=${name}"
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"--log-driver=${container.log-driver}"
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] ++ optional (container.entrypoint != null)
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"--entrypoint=${escapeShellArg container.entrypoint}"
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++ (mapAttrsToList (k: v: "-e ${escapeShellArg k}=${escapeShellArg v}") container.environment)
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++ map (p: "-p ${escapeShellArg p}") container.ports
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++ optional (container.user != null) "-u ${escapeShellArg container.user}"
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++ map (v: "-v ${escapeShellArg v}") container.volumes
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++ optional (container.workdir != null) "-w ${escapeShellArg container.workdir}"
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++ map escapeShellArg container.extraDockerOptions
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++ [container.image]
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++ map escapeShellArg container.cmd
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);
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ExecStop = ''${pkgs.bash}/bin/sh -c "[ $SERVICE_RESULT = success ] || docker stop ${name}"'';
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### There is no generalized way of supporting `reload` for docker
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### containers. Some containers may respond well to SIGHUP sent to their
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### init process, but it is not guaranteed; some apps have other reload
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### mechanisms, some don't have a reload signal at all, and some docker
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### images just have broken signal handling. The best compromise in this
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### case is probably to leave ExecReload undefined, so `systemctl reload`
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### will at least result in an error instead of potentially undefined
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### behaviour.
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###
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### Advanced users can still override this part of the unit to implement
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### a custom reload handler, since the result of all this is a normal
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### systemd service from the perspective of the NixOS module system.
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###
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# ExecReload = ...;
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###
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TimeoutStartSec = 0;
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TimeoutStopSec = 120;
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Restart = "always";
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};
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};
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in {
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options.docker-containers = mkOption {
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default = {};
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type = types.attrsOf (types.submodule dockerContainer);
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description = "Docker containers to run as systemd services.";
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};
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config = mkIf (cfg != {}) {
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systemd.services = mapAttrs' (n: v: nameValuePair "docker-${n}" (mkService n v)) cfg;
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virtualisation.docker.enable = true;
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};
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}
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